S
M
T
W
T
F
S
26
N/A
27
57°
36°
28
54°
41°
29
49°
45°
30
52°
46°
1
54°
36°
2
50°
35°
3
52°
37°
4
58°
44°
5
59°
46°
6
62°
45°
7
60°
44°
8
60°
45°
9
59°
46°
10
60°
44°
11
60°
41°
12
61°
43°
13
61°
47°
14
64°
44°
15
61°
42°
16
61°
43°
17
59°
42°
18
60°
42°
19
64°
50°
20
64°
46°
21
63°
44°
22
63°
45°
23
62°
44°
24
63°
46°
25
64°
51°
26
66°
48°
27
65°
46°
28
64°
46°
29
68°
53°
30
73°
54°
31
72°
51°
1
69°
53°
2
72°
55°
3
75°
55°
4
68°
54°
5
75°
51°
6
68°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Cohasset
Cohasset's May 2026 forecast shows daily high temperatures ranging from 49° to 75°, with overnight lows between 35° and 55°. The average high for May is 62° with an average low of 46°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Cohasset. See also: June | July | August.
